NASCLA Electrical Contractor / Master Electrician Course Notes

General Code Requirements is tied for the largest domain at 17 scored items. Treat Articles 90, 100, and 110 as your code-navigation foundation. Know definitions exactly, distinguish working space from dedicated equipment space, follow listing/labeling and manufacturer instructions, and use only the NEC editions listed by PSI.

• Treating OSHA as the source for NEC installation dimensions.

• 17 items: tab Articles 90, 100, and 110 heavily.

Wiring & Protection is also 17 scored items. This is the calculation center of the exam. Use the correct sequence: determine load → apply demand/continuous-load rules → select conductor ampacity → apply temperature/adjustment corrections → verify terminal limits → select permitted OCPD → check grounding/bonding and any voltage-drop design issue.

• Applying 125% to every load regardless of continuous status.

• 17 items: know Articles 210, 220, 230, 240, 250.

Wiring Methods & Materials is 16 scored items. Chapter 3 is table-heavy. Learn the lookup path rather than trying to memorize every number: conductor type/location → ampacity/correction → raceway/cable article → fill/support/bends → boxes/fittings → environmental suitability.

• Calling voltage drop 'derating.'

• 16 items: tab Chapter 3 and Chapter 9.

Equipment for General Use is 13 scored items. Motors and transformers are especially high-yield because the Code intentionally uses different tables/rules for conductor sizing, overload protection, and short-circuit/ground-fault protection. Do not size everything from the motor nameplate current.

• Using motor nameplate current for every Article 430 calculation.

• 13 items: tab Articles 410, 422, 430, 440, 445, 450.

Electrical Theory is 11 scored items. Keep units disciplined. Most exam calculations collapse to a small formula set: V=IR, P=VI, single-phase P=VI×PF, three-phase P=√3VI×PF, and resistance/power rearrangements. Know series versus parallel behavior before touching the calculator.

• Using P=VI without power factor when the problem asks AC real power and PF is supplied.

• 11 items: memorize the small formula core.

Safety is 9 scored items. The controlling principle is de-energize whenever feasible. OSHA 1926 applies to construction activity; OSHA 1910 generally applies to general-industry/maintenance contexts; NFPA 70E provides workplace electrical-safety practices such as risk assessment, energized-work controls, boundaries, and PPE.

• Choosing PPE first without asking whether the circuit can/should be de-energized.

• 9 items: de-energize is the default safe answer when feasible/required.

Project Design & Management is 8 scored items. Think like an electrical contractor: verify scope from drawings/specs, build a quantity/labor estimate, identify long-lead gear, coordinate with other trades, protect changes in writing, and commission/close out the system.

• Reading only floor plans and ignoring one-lines/specs.

• 8 items: plan reading + contractor workflow.

Special Occupancies/Equipment/Conditions is 8 scored items. The trick is article recognition. Chapters 5–7 modify or supplement Chapters 1–4. Identify the occupancy/equipment/system first, then jump to the specialized article and read its relationship to general rules.

• Using only general Chapter 3 rules in a special occupancy.

• 8 items: article recognition beats memorizing every subsection.

Communication Systems is only 1 scored item, so keep it efficient. Know that Chapter 8 covers communications systems and has its own relationship to Chapters 1–7. Focus on separation from power conductors, support, grounding/bonding, listed cable, penetrations, and building-entry protection.

• Treating low voltage as unregulated.

• Only 1 item: don't over-study.